NetBSD/usr.bin/ktrace/ktrace.c

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/* $NetBSD: ktrace.c,v 1.23 2001/05/04 07:09:55 simonb Exp $ */
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/*-
* Copyright (c) 1988, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
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#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1988, 1993\n\
The Regents of the University of California. All rights reserved.\n");
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#endif /* not lint */
#ifndef lint
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#if 0
static char sccsid[] = "@(#)ktrace.c 8.2 (Berkeley) 4/28/95";
#else
__RCSID("$NetBSD: ktrace.c,v 1.23 2001/05/04 07:09:55 simonb Exp $");
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#endif
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#endif /* not lint */
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/wait.h>
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#include <sys/file.h>
#include <sys/time.h>
#include <sys/uio.h>
#include <sys/ktrace.h>
#include <sys/socket.h>
#include <err.h>
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
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#include "ktrace.h"
#ifdef KTRUSS
#include <string.h>
#include "setemul.h"
#endif
int main __P((int, char **));
int rpid __P((char *));
void usage __P((void));
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int do_ktrace __P((const char *, int, int,int));
void no_ktrace __P((int));
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#ifdef KTRUSS
extern int timestamp, decimal, fancy, tail, maxdata;
#endif
int
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main(argc, argv)
int argc;
char **argv;
{
enum { NOTSET, CLEAR, CLEARALL } clear;
int append, ch, fd, inherit, ops, pid, pidset, synclog, trpoints;
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const char *infile, *outfile;
#ifdef KTRUSS
const char *emul_name = "netbsd";
#endif
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clear = NOTSET;
append = ops = pidset = inherit = synclog = 0;
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trpoints = DEF_POINTS;
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pid = 0; /* Appease GCC */
#ifdef KTRUSS
# define OPTIONS "aCce:df:g:ilm:o:p:RTt:"
outfile = infile = NULL;
#else
# define OPTIONS "aCcdf:g:ip:st:"
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outfile = infile = DEF_TRACEFILE;
#endif
while ((ch = getopt(argc,argv, OPTIONS)) != -1)
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switch((char)ch) {
case 'a':
append = 1;
break;
case 'C':
clear = CLEARALL;
pidset = 1;
break;
case 'c':
clear = CLEAR;
pidset = 1;
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break;
case 'd':
ops |= KTRFLAG_DESCEND;
break;
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#ifdef KTRUSS
case 'e':
emul_name = strdup(optarg); /* it's safer to copy it */
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break;
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case 'f':
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infile = optarg;
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break;
#else
case 'f':
infile = outfile = optarg;
break;
#endif
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case 'g':
pid = -rpid(optarg);
pidset = 1;
break;
case 'i':
inherit = 1;
break;
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#ifdef KTRUSS
case 'l':
tail = 1;
break;
case 'm':
maxdata = atoi(optarg);
break;
case 'o':
outfile = optarg;
break;
#endif
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case 'p':
pid = rpid(optarg);
pidset = 1;
break;
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#ifdef KTRUSS
case 'R':
timestamp = 2; /* relative timestamp */
break;
#else
case 's':
synclog = 1;
break;
#endif
#ifdef KTRUSS
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case 'T':
timestamp = 1;
break;
#endif
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case 't':
trpoints = getpoints(optarg);
if (trpoints < 0) {
warnx("unknown facility in %s", optarg);
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usage();
}
break;
default:
usage();
}
argv += optind;
argc -= optind;
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if (!infile && ((pidset && *argv) || (!pidset && !*argv)))
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usage();
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#ifdef KTRUSS
if (infile) {
dumpfile(infile, 0, trpoints);
exit(0);
}
setemul(emul_name, 0, 0);
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#endif
/*
* For cleaner traces, initialize malloc now rather
* than in a traced subprocess.
*/
free(malloc(1));
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if (inherit)
trpoints |= KTRFAC_INHERIT;
(void)signal(SIGSYS, no_ktrace);
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if (clear != NOTSET) {
if (clear == CLEARALL) {
ops = KTROP_CLEAR | KTRFLAG_DESCEND;
trpoints = ALL_POINTS;
pid = 1;
} else
ops |= pid ? KTROP_CLEAR : KTROP_CLEARFILE;
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(void)do_ktrace(outfile, ops, trpoints, pid);
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exit(0);
}
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if (outfile && strcmp(outfile, "-")) {
if ((fd = open(outfile, O_CREAT | O_WRONLY |
(append ? 0 : O_TRUNC) | (synclog ? 0 : O_SYNC),
DEFFILEMODE)) < 0)
err(1, "%s", outfile);
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(void)close(fd);
}
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if (*argv) {
#ifdef KTRUSS
if (do_ktrace(outfile, ops, trpoints, getpid()) == 1) {
execvp(argv[0], &argv[0]);
err(1, "exec of '%s' failed", argv[0]);
}
#else
(void) do_ktrace(outfile, ops, trpoints, getpid());
execvp(argv[0], &argv[0]);
err(1, "exec of '%s' failed", argv[0]);
#endif
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} else
(void)do_ktrace(outfile, ops, trpoints, pid);
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exit(0);
}
int
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rpid(p)
char *p;
{
static int first;
if (first++) {
warnx("only one -g or -p flag is permitted.");
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usage();
}
if (!*p) {
warnx("illegal process id.");
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usage();
}
return(atoi(p));
}
void
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usage()
{
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#ifdef KTRUSS
# define LONG_OPTION "[-e emulation] [-m maxdata] [-o outfile] "
# define SHRT_OPTION "RT"
#else
# define LONG_OPTION ""
# define SHRT_OPTION ""
#endif
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(void)fprintf(stderr,
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"Usage:\t%s [-aCcid%s] %s[-f trfile] [-g pgid] [-p pid] [-t [cenisw+]]\n\t%s [-aCcid%s] %s[-f trfile] [-t [cenisw+]] command\n",
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getprogname(), SHRT_OPTION, LONG_OPTION,
getprogname(), SHRT_OPTION, LONG_OPTION);
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exit(1);
}
void
no_ktrace(sig)
int sig;
{
(void)fprintf(stderr,
"error:\tktrace() system call not supported in the running kernel\n\tre-compile kernel with 'options KTRACE'\n");
exit(1);
}
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int
do_ktrace(tracefile, ops, trpoints, pid)
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const char *tracefile;
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int ops;
int trpoints;
int pid;
{
int ret;
if (!tracefile || strcmp(tracefile, "-") == 0) {
int pi[2], dofork, fpid;
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if (pipe(pi) < 0)
err(1, "pipe(2)");
fcntl(pi[0], F_SETFD, FD_CLOEXEC|fcntl(pi[0], F_GETFD, 0));
fcntl(pi[1], F_SETFD, FD_CLOEXEC|fcntl(pi[1], F_GETFD, 0));
dofork = (pid == getpid());
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#ifdef KTRUSS
if (dofork)
fpid = fork();
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else
fpid = pid; /* XXX: Gcc */
#else
if (dofork)
fpid = fork();
else
fpid = 0; /* XXX: Gcc */
#endif
#ifdef KTRUSS
if (fpid)
#else
if (!dofork || !fpid)
#endif
{
if (!dofork)
#ifdef KTRUSS
ret = fktrace(pi[1], ops, trpoints, fpid);
#else
ret = fktrace(pi[1], ops, trpoints, pid);
#endif
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else
close(pi[1]);
#ifdef KTRUSS
dumpfile(NULL, pi[0], trpoints);
waitpid(fpid, NULL, 0);
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#else
{
char buf[512];
int n, cnt = 0;
while ((n = read(pi[0], buf, sizeof(buf)))>0) {
write(1, buf, n);
cnt += n;
}
}
if (dofork)
_exit(0);
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#endif
return 0;
}
close(pi[0]);
#ifdef KTRUSS
if (dofork && !fpid) {
ret = fktrace(pi[1], ops, trpoints, getpid());
return 1;
}
#else
ret = fktrace(pi[1], ops, trpoints, pid);
#endif
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} else
ret = ktrace(tracefile, ops, trpoints, pid);
if (ret < 0)
err(1, "%s", tracefile);
return 1;
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}